Added support for Protobuf serializer.

[butschster]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.11111% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 83.24%. Comparing base (f484db5) to head (29c7af9).
Report is 2 commits behind head on 2.x.

Files	Patch %	Lines
src/Normalizer/ProtobufMessageNormalizer.php	80.00%	4 Missing ⚠️
src/Encoder/ProtobufEncoder.php	90.90%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                2.x      #31      +/-   ##
============================================
+ Coverage     82.55%   83.24%   +0.69%     
- Complexity       57       75      +18     
============================================
  Files             7        9       +2     
  Lines           149      185      +36     
============================================
+ Hits            123      154      +31     
- Misses           26       31       +5     

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